Fishing tool



' sired point for engaging with it. posite sides the blade 'l is recessed, form- Patentediluly 22, 1924,

rares JAMES S. ABERCROMBIE, 0F HOUSTON, TEXAS. 'i

FISHING TOOL.

Application fnea January 2s, 1921. `serial No. 449,764.

pose of engaging with and` withdrawing.

pipe from well bores.

Another object of the invention is to provide a fishing tool equipped with ,pipe-en# gaging jaws of novel formation which are pivotally mounted so that thel tool may be readily let down into the bore without the dogs engaging against the pipe, but upon upward pull of the tool, said dogs will engage with and withdraw said pipe from the bore.

A further feature of the invention residesin the provision of a fishing tool which is of simple construction and which conl sequently may be cheaply and easily manu= factured.

With the above and other objects in view the invention has particular relation to certain novel features of construction, opera-` tion and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure l is a side elevation of the tool,

Figure 2 is an edge view, and Figure 3 shows a sectional view taken on the line 3-3 of Figure 2.

Referring now more particularly to the drawings wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 refers to a blade-like bit whose upper end 2 is reduced and outwardly threaded to receive the lower end of a string of pipe through which the tool is let down into the pipe to be withdrawn. The lower end of the bit may be of any desired form but it is preferably pointed .so that, if the pipe to be withdrawn is crushed or of irregular formation the tool may be forced downwardly therethrough to the de- On oping the upper sloping shoulders 4, and the lower abrupt shoulders 5 and presenting also the lateral faces 6, 6 which diverge vfrom the well bore,

slightly downwardly.k Pipe-engaging dogs 7 and 8' ,arey

9 whichy passes throughy said dogs and through theblade and which is secured in place by the usual nut 10. The outer kends of these dogs are arcuate in form andare serrated, formingtlie pipe-engaging lteeth 1l. It is to be observedthat these dogs project out in opposite directions so as toengage l f to 'bef pulled. TheseV dogs are formed with4 the4 against opposite sidesl .of the pipe overturned flanges l2 a'nd 13 .which fit aroundthe respec'tive'edgesl ofthe blade, and' each dog is formed with the diverging faces ,14, and 15, which vopposethe corre". sponding faces 6 of the blade l. As the tool is being let down into the pipe the dogs will assume the position shown in dotted lines in Figure l, the faces 14 fitting against the opposing faces 6, and said dogs will consequently not engage with the pipe or interfere with the descent of the tool. vUpon upward pull, said dogs will engage against the walls of the pipe to be pulled and will be carried out in position indicated by the full line in Figure l, the faces l5 thereof fitting' closely against the opposing' faces 6 of the blade l, and said dogs resting upon the supporting shoulders 5. An upward pull on the pipe 3 will usually operate to withdraw the pipe, sought to be pulled, K K and it isto be noted that the load sustained by said dogs will be carried by the shoulders 5 and the opposing faces 6,'sa.id ydogs being in effect wedged between theinso thatY the bolt 9 will take only a small amount, if any, of the strain and will not be liable to' be sheared 0E. This is a very important feature inasmuch asy the tool is subjected to great strain in withdrawing the pipe, which ifel-l borne by the bolt would shear the same o If it is found that the pipe to be pulled cannot be withdrawn, the tool may then be rotated and gradually screwed out of the pipe. ForV this reason the teeth ll are given a pitch, as shown in Figure 2, similar to the pitch of screw threads and the tool may thus be in effect unscrewed from the joint ofpipe toy which it is attached.

What I claim,is:-

l. A lishing tool including a. supporting member, pipe engaging dogs pivoted thereprovided f' having flat bodies. i which fit against opposite sidesrof the blade; and are pivo-ted thereto by means of the bolt:

to @dressage apposite @ir-,ems be yond said member, said projecting ends having overturned anges formedl with` grooves which receive the edges of said member.

2. A fishing tool including a supporting member whose oppositel edges are formedV with flat Jfaces, pipe engaging dogs pivoted to said member and projecting in opposite directions beyond it, the projecting end oi" each dogl Vbeing formed. with `diverging shoulders opposing' the corresponding face,

of #said .supporting member.

A tishin'g tool including a supporting member whoser opposite edges are formed with Vflat Jraces, pipeengaging dogs pivoted tosaidamemberiand projecting inA opposite f `directions'beyond it, the projecting end of each dog` being Aforme/i withy diverging shoulders opposing thefcorresponding face, said projecgingl spiraled teeth.

*4. A fishing teolincluding a supporting member havingits opposite edgesl Jformed into iriat Jfaces, pipe engaging dogs pivoted to said member and projecting beyond it in ends being Vformed with Aopposite directions, said projectingends being serrated, diverging shoulders formed on each dog` which oppose the corresponding face, said shoulders being extended, forming flanges which embrace said member.

j' 5 5. A fishing tool includinga flat supporting member whose opposite edges are recessed `forming a sloping shoulder above each recess and an abrupt shoulder below the recess, pipe engaging dogs pivotedv to of two subscribing witnesses. Y

Y JAMES S. ABERGRQMBIE., lWitnesses:

J-No. B. OLIVER,

E. V. HARDWAY. 

